
Grosmont Castle stands as one of the 'Three Castles of Gwent,' a Norman defensive stronghold in Monmouthshire ten miles northwest of Monmouth near the Herefordshire border. Initially built as an 11th-century earth and timber fort, it was reconstructed in stone during the 13th century by Hubert de Burgh with added gatehouse and circular towers. The castle gained royal importance when King Henry III's son Edmund Crouchback was granted the property, and his son Henry of Grosmont was born there in 1310. Today managed by Cadw as a free open-access site, visitors can explore the ruined fortress daily from 10 am to 4 pm.